This tweet discusses bypassing source check on postMessage to achieve XSS. It highlights a method to bypass security checks in order to execute a cross-site scripting attack. This vulnerability can potentially affect various WAF vendors. For more technical details, please refer to the original tweet by @elmehdimee.
For more insights, check out the original tweet here: https://twitter.com/MiniMjStar/status/1912942937043796142